The mesh on this mask is so thin that it quickly clogs with dirt/pollen/grass bits. After less than 12 hours of wear, the part of the mask over my horse's nostrils was completely clogged (picture) making the long-nosed model dangerous. It was a dry day on short grass and my horse had no nasal discharge to cause. I cut off the nasal valve and will only use it for riding. I have a Crusader model and don't have as many problems with clogged nose shields - the holes in the mesh are larger. This model is nice and easy to ride but I wouldn't leave it on my horse to accelerate etc.
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